Note that with standard sed (non-GNU) there needs to be a ; before the trailing }:

Code:

ip=$(sed -n '/inet */{s///p;q;}' config.boot)

or we can avoid the braces by using negation style:

Code:

ip=$(sed '/inet */!d; s///; q' config.boot)

--
Alternatively we can avoid the sub shell / external command altogether with just standard shell:

Code:

until [ "$inet" = inet ]; do
read inet ip
done < config.boot

--
Note also that these are all naive approaches without knowing what the format of config.boot looks like. Also, if the are more inet configs in the same file, these will only pick the first one indiscriminately.

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